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<h1 id="title">FBB::IOStreambuf</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz</h2>
<h2 id="date">2005-2016</h2>
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<h1 id="title">FBB::IOStreambuf(3bobcat)</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz Streambuf doing I/O</h2>
<h2 id="date">2005-2016</h2>
<p>
<h2 >NAME</h2>FBB::IOStreambuf - streambuf allowing input and output operations
<p>
<h2 >SYNOPSIS</h2>
<strong >#include <bobcat/iostreambuf></strong><br/>
Linking option: <em >-lbobcat</em>
<p>
<h2 >DESCRIPTION</h2>
This class implements a specialization of the <strong >std::streambuf</strong> class,
allowing input operations from and output operations to different files. It is
intended to be used in combination with <strong >FBB::IOStream</strong>, thus allowing all
stream-based input and output operations using the same object without the
need to use <em >seek</em>-operations. Using an <strong >FBB::IOStream</strong> object it is,
e.g., possible to construct two-way communications using pipes, much like the
facilities offered by sockets.
<p>
If the streams that will be associated with the <strong >IOStreambuf</strong> object
support seeking, then the <strong >IOStreambuf</strong> will do so to. Seeking might also be
available for a single stream (either the <strong >std::istream</strong> or the
<strong >std::ostream</strong>).
<p>
When the <strong >IOStreambuf</strong> object goes out of scope, its associated
<strong >std::ostream</strong> object is flushed.
<p>
<h2 >NAMESPACE</h2>
<strong >FBB</strong><br/>
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong >FBB</strong>.
<p>
<h2 >INHERITS FROM</h2>
<strong >std::streambuf</strong>
<p>
<h2 >CONSTRUCTORS</h2>
<ul>
<li> <strong >IOStreambuf()</strong>:<br/>
The default constructor results in a <strong >IOStreambuf</strong> object that
cannot be immediately used. Its member <strong >open()</strong> must be called first.
<li> <strong >IOStreambuf(std::istream &in, std::ostream &out)</strong>:<br/>
This constructor associates the <strong >IOStreambuf</strong> object with a
<strong >std::istream</strong> and a <strong >std::ostream</strong>. All output operations will be passed
on to the <strong >std::ostream</strong>, all input operations to the <strong >std::istream</strong>. The
streams passed to <strong >IOStreambuf()</strong> should outlive the <strong >IOStreambuf</strong>
object.
</ul>
Copy and move constructors is not available.
<p>
<h2 >MEMBER FUNCTIONS</h2>
All members of <strong >std::streambuf</strong> are
available, as <strong >FBB::IOStreambuf</strong> inherits from these classes.
<ul>
<li> <strong >void open(std::istream &in, std::ostream &out)</strong>:<br/>
This member (re)associates the <strong >IOStreambuf</strong> object with a
<strong >std::istream</strong> and a <strong >std::ostream</strong>. All output operations will be passed
on to the <strong >std::ostream</strong>, all input operations to the <strong >std::istream</strong>. The
streams passed to <strong >IOStreambuf()</strong> should outlive the <strong >IOStreambuf</strong>
object. If this member is called for an <strong >IOStreambuf</strong> object already
associated with an <strong >std::ostream</strong> object, the already associated
<strong >std::ostream</strong> object is flushed before setting up the new association.
</ul>
<p>
<h2 >VIRTUAL PROTECTED MEMBER FUNCTIONS</h2>
<p>
The following <strong >std::streambuf</strong> member functions should only be called
when the <strong >FBB::Streambuf</strong> object is associated with <strong >std::istream</strong> and
<strong >std::ostream</strong> objects (i.e., they should not be called between the
construction of a default <strong >FBB:IOStreambuf</strong> object and a subsequent call of
<strong >IOStreambuf::open()</strong>):
<p>
The members listed in this section implement the tasks of
comparably named virtual function in the class's private interface. This
separates the redefinable interface from the user-interface. The class
<strong >IOStreamBuf</strong> can, in accordance with Liskov's Substitution Principle, be
used as a <em >std:streambuf</em>; but it also offers facilities for classes
deriving from <strong >IOStreamBuf</strong>. These facilities are listed here.
<p>
<ul>
<li> <strong >pos_type pSeekoff(off_type offset, std::ios::seekdir way,
std::ios::openmode mode =
std::ios::in | std::ios::out)</strong>:<br/>
With seekable streams, repositions the associated <strong >std::istream</strong>
or <strong >std::ostream</strong> is repositioned to offset <em >offset</em>, relative to
<em >way</em>.
<li> <strong >pos_type pSeekpos(off_type offset, std::ios::openmode mode =
std::ios::in | std::ios::out)</strong>:<br/>
With seekable streams, repositions the associated <strong >std::istream</strong>
or <strong >std::ostream</strong> is repositioned to offset <em >offset</em>, relative to
the beginning of the stream.
<li> <strong >int pSync()</strong>:<br/>
This member flushes the associated <strong >std::ostream</strong> object.
<li> <strong >std::streamsize pXsputn(char const *buffer, std::streamsize n)</strong>:<br/>
This member inserts <em >n</em> characters from <em >buffer</em> into the
associated <strong >std::ostream</strong> stream.
</ul>
<p>
<h2 >EXAMPLE</h2>
See the example provided with <strong >process</strong>(3bobcat).
<p>
<h2 >FILES</h2>
<em >bobcat/iostreambuf</em> - defines the class interface
<p>
<h2 >SEE ALSO</h2>
<strong >bobcat</strong>(7), <strong >iostream</strong>(3bobcat), <strong >process</strong>(3bobcat)
<p>
<h2 >BUGS</h2>
None reported.
<p>
<h2 >DISTRIBUTION FILES</h2>
<ul>
<li> <em >bobcat_4.04.00-x.dsc</em>: detached signature;
<li> <em >bobcat_4.04.00-x.tar.gz</em>: source archive;
<li> <em >bobcat_4.04.00-x_i386.changes</em>: change log;
<li> <em >libbobcat1_4.04.00-x_*.deb</em>: debian package holding the
libraries;
<li> <em >libbobcat1-dev_4.04.00-x_*.deb</em>: debian package holding the
libraries, headers and manual pages;
<li> <em >http://sourceforge.net/projects/bobcat</em>: public archive location;
</ul>
<p>
<h2 >BOBCAT</h2>
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2 >COPYRIGHT</h2>
This is free software, distributed under the terms of the
GNU General Public License (GPL).
<p>
<h2 >AUTHOR</h2>
Frank B. Brokken (<strong >f.b.brokken@rug.nl</strong>).
<p>
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